back and forth 前后，来回
They discussed it back and forth,without getting very far.他们翻来覆去地讨论，没有多大进展。
before long 不久以后，很快
The book will be published before long.这本书不久就要出版。
begin with 首先
You should begin with this book.你该先读这本书。
To begin with,we must consider the problem from all sides.首先，我们必须从全盘考虑这个问题。
break away离开，逃离
The prisoner broke away from the two policemen who were holding him.囚犯从两个警察手中逃脱了。
break down 损害，失败
The generator broke down.发电机出了毛病。
break off 中断，突然停止
He has broken off all relations with her.他断绝了与她的一切关系。
break out 爆发 出现
Fire broke out in the neighhorhood last night.昨晚附近发生了火灾。
break up 打碎 结束 破裂
Their marriage broke up.他们的婚姻破裂了。
bring about 导致， 引起
It may bring about a revolution in industry.这可能会导致一场工业上的革命。
bring down 降低 落下
The government is determined to bring down inflation.政府决心降低通货膨胀。
bring forth 产生，提出
Tree bring forth fruits.树木能结出果实。
bring forward 提议，提前
Can you bring forward any proof of what you said?你能为你所说的话提供证据吗?
bring into operation 实施 生效
The new law bring into operation next month.新的法律下个月开始实施。
bring up培养，教育
We were brought up to respect the old.我们从小就被教导要尊敬老人。
build up 逐步建立，增强
After four o'clock the traffic begins to build up.四点钟以后交通开始拥挤起来。
burn out 烧光，熄灭
The fire had burnt out before the fire brigade arrived.在消防队赶到以前，火已熄灭。
burn up烧起来，旺起来
Please put more wood on a fire to make it burn up.请再往火上添加木柴让它烧旺些。
but for 要不是，如果没有
But for you ,we couldn't have carried out the plan.要是没有您，我们无法执行那个计划。
But for his help,we would have lost the game.要不是他帮助，我们可能会输掉这场比赛的。
by accident 偶然地
Columbus discovered America by accident.哥伦布偶然地发现了美洲。
by all means 当然可以，完全可以
-May I borrow your paper? 我可以借你的报纸吗？
-By all means.当然可以。
by comparison with 与...比较起来
Living in the big cities is much convenient by comparison with the country.与乡下相比，在大城市生活比较便利。
by means of 用，凭借
The deaf often communicate by means of signs.耳聋者经常借助手势交流。
by mistake 不是故意地，错误地
I paid the bill twice by mistake.我弄错了，付了两次账。
by no means 决不
I'm by no means satisfied with your work.我对你的工作一点也不满意。
by reason of 由于，因为
By reason of his absence, we can't play the game.由于他的缺席我们无法玩这个游戏。
by the way 顺便说一下
By the way,do you know my new address?顺便说一下，你知道我的新地址吗？
by way of 经过，经由
You'll have to go by way of Hong Kong if you want to go to London from here.你要想从这儿到伦敦必须经由香港。
